IDEAS home Printed from https://ideas.repec.org/a/eee/ecosys/v44y2020i1s0939362519300482.html
   My bibliography  Save this article

Credit risk pricing and the rationality of lending decision-making within dual banking systems: A parametric approach

Author

Listed:
  • Louhichi, Awatef
  • Boujelbene, Younes

Abstract

The reduction of non-performing loans, and making correct provisions for them, plays a primary role in the management and minimization of banking credit risk. However, these actions depend primarily upon the cost at which banks may dispose of these bad loans. Hence, this study aims to perceive the price of banks’ credit risk via estimating the shadow price of non-performing loans. We assess and compare the perceived price of the credit risk of Islamic and conventional banks operating in 9 countries from the Middle East and Asia, using a quadratic directional distance function. Following this, we evaluate the impact of different settings of directional vectors on shadow prices by conducting a risk-sensitivity analysis. Applying bootstrap regression, the factors affecting NPLs’ prices are further investigated. The paper concludes that the estimation of the shadow prices of bad loans can provide important elements in favor of credit risk management and, therefore, credit risk mitigation.

Suggested Citation

  • Louhichi, Awatef & Boujelbene, Younes, 2020. "Credit risk pricing and the rationality of lending decision-making within dual banking systems: A parametric approach," Economic Systems, Elsevier, vol. 44(1).
  • Handle: RePEc:eee:ecosys:v:44:y:2020:i:1:s0939362519300482
    DOI: 10.1016/j.ecosys.2019.100740
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0939362519300482
    Download Restriction: Full text for ScienceDirect subscribers only

    File URL: https://libkey.io/10.1016/j.ecosys.2019.100740?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    References listed on IDEAS

    as
    1. Fernandez C. & Koop G. & Steel M.F.J., 2002. "Multiple-Output Production With Undesirable Outputs: An Application to Nitrogen Surplus in Agriculture," Journal of the American Statistical Association, American Statistical Association, vol. 97, pages 432-442, June.
    2. Pejman Abedifar & Philip Molyneux & Amine Tarazi, 2013. "Risk in Islamic Banking," Review of Finance, European Finance Association, vol. 17(6), pages 2035-2096.
    3. Weill, Laurent, 2011. "How corruption affects bank lending in Russia," Economic Systems, Elsevier, vol. 35(2), pages 230-243, June.
    4. Podpiera, Jiri & Weill, Laurent, 2008. "Bad luck or bad management? Emerging banking market experience," Journal of Financial Stability, Elsevier, vol. 4(2), pages 135-148, June.
    5. Mr. Alfred Kammer & Mr. Mohamed Norat & Mr. Marco A. Piñón-Farah & Mr. Ananthakrishnan Prasad & Mr. Christopher M Towe & Mr. Zeine Zeidane, 2015. "Islamic Finance: Opportunities, Challenges, and Policy Options," IMF Staff Discussion Notes 2015/005, International Monetary Fund.
    6. Assaf, A. George & Josiassen, Alexander & Gillen, David, 2014. "Measuring firm performance: Bayesian estimates with good and bad outputs," Journal of Business Research, Elsevier, vol. 67(6), pages 1249-1256.
    7. Saeed, Momna & Izzeldin, Marwan, 2016. "Examining the relationship between default risk and efficiency in Islamic and conventional banks," Journal of Economic Behavior & Organization, Elsevier, vol. 132(S), pages 127-154.
    8. Fare, Rolf & Grosskopf, Shawna & Weber, William L., 2006. "Shadow prices and pollution costs in U.S. agriculture," Ecological Economics, Elsevier, vol. 56(1), pages 89-103, January.
    9. Mariani Abdul-Majid & David Saal & Giuliana Battisti, 2010. "Efficiency in Islamic and conventional banking: an international comparison," Journal of Productivity Analysis, Springer, vol. 34(1), pages 25-43, August.
    10. Fujii, Hidemichi & Managi, Shunsuke & Matousek, Roman, 2014. "Indian bank efficiency and productivity changes with undesirable outputs: A disaggregated approach," Journal of Banking & Finance, Elsevier, vol. 38(C), pages 41-50.
    11. Demirguc-Kunt, Asli & Laeven, Luc & Levine, Ross, 2004. "Regulations, Market Structure, Institutions, and the Cost of Financial Intermediation," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 36(3), pages 593-622, June.
    12. Berger, Allen N. & DeYoung, Robert, 1997. "Problem loans and cost efficiency in commercial banks," Journal of Banking & Finance, Elsevier, vol. 21(6), pages 849-870, June.
    13. Jokipii, Terhi & Milne, Alistair, 2008. "The cyclical behaviour of European bank capital buffers," Journal of Banking & Finance, Elsevier, vol. 32(8), pages 1440-1451, August.
    14. Alandejani, Maha & Kutan, Ali M. & Samargandi, Nahla, 2017. "Do Islamic banks fail more than conventional banks?," Journal of International Financial Markets, Institutions and Money, Elsevier, vol. 50(C), pages 135-155.
    15. Rolf Färe & Shawna Grosskopf & Carl A Pasurka, Jr., 2001. "Accounting for Air Pollution Emissions in Measures of State Manufacturing Productivity Growth," Journal of Regional Science, Wiley Blackwell, vol. 41(3), pages 381-409, August.
    16. J.A. Bikker & Tobias M. Vervliet, 2017. "Bank Profitability and Risk-Taking under Low Interest Rates," Working Papers 17-10, Utrecht School of Economics.
    17. George Assaf, A. & Matousek, Roman & Tsionas, Efthymios G., 2013. "Turkish bank efficiency: Bayesian estimation with undesirable outputs," Journal of Banking & Finance, Elsevier, vol. 37(2), pages 506-517.
    18. Berg, Sigbjorn Atle & Forsund, Finn R & Jansen, Eilev S, 1992. " Malmquist Indices of Productivity Growth during the Deregulation of Norwegian Banking, 1980-89," Scandinavian Journal of Economics, Wiley Blackwell, vol. 94(0), pages 211-228, Supplemen.
    19. Richard Simper & Maximilian J. B. Hall & WenBin Liu & Valentin Zelenyuk & Zhongbao Zhou, 2017. "How relevant is the choice of risk management control variable to non-parametric bank profit efficiency analysis? The case of South Korean banks," Annals of Operations Research, Springer, vol. 250(1), pages 105-127, March.
    20. Hilary, Gilles & Hui, Kai Wai, 2009. "Does religion matter in corporate decision making in America?," Journal of Financial Economics, Elsevier, vol. 93(3), pages 455-473, September.
    21. Ching-Cheng Chang, 1999. "The Nonparametric Risk-Adjusted Efficiency Measurement: An Application to Taiwan's Major Rural Financial Intermediaries," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 81(4), pages 902-913.
    22. Avkiran, Necmi Kemal, 1999. "The evidence on efficiency gains: The role of mergers and the benefits to the public," Journal of Banking & Finance, Elsevier, vol. 23(7), pages 991-1013, July.
    23. Bitar, Mohammad & Madiès, Philippe & Taramasco, Ollivier, 2017. "What makes Islamic banks different? A multivariate approach," Economic Systems, Elsevier, vol. 41(2), pages 215-235.
    24. Khan, Tariqullah & Ahmed, Habib, 2001. "Risk Management: An Analysis of Issues in Islamic Financial Industry (Occasional Paper)," Occasional Papers 2001, The Islamic Research and Teaching Institute (IRTI).
    25. Laeven, Luc & Ratnovski, Lev & Tong, Hui, 2016. "Bank size, capital, and systemic risk: Some international evidence," Journal of Banking & Finance, Elsevier, vol. 69(S1), pages 25-34.
    26. M. Kabir Hassan & Mervyn K. Lewis (ed.), 2007. "Handbook of Islamic Banking," Books, Edward Elgar Publishing, number 3621.
    27. Aparicio, Juan & Pastor, Jesus T. & Zofio, Jose L., 2015. "How to properly decompose economic efficiency using technical and allocative criteria with non-homothetic DEA technologies," European Journal of Operational Research, Elsevier, vol. 240(3), pages 882-891.
    28. Partovi, Elmira & Matousek, Roman, 2019. "Bank efficiency and non-performing loans: Evidence from Turkey," Research in International Business and Finance, Elsevier, vol. 48(C), pages 287-309.
    29. Ibrahim, Mansor H. & Rizvi, Syed Aun R., 2017. "Do we need bigger Islamic banks? An assessment of bank stability," Journal of Multinational Financial Management, Elsevier, vol. 40(C), pages 77-91.
    30. Mohammad Bitar & Philippe Madiès & Ollivier Taramasco, 2017. "What makes Islamic banks different ? A multivariate approach," Post-Print hal-01980549, HAL.
    31. Barros, Carlos Pestana & Managi, Shunsuke & Matousek, Roman, 2012. "The technical efficiency of the Japanese banks: Non-radial directional performance measurement with undesirable output," Omega, Elsevier, vol. 40(1), pages 1-8, January.
    32. Georgios E. Chortareas & Claudia Girardone & Alexia Ventouri, 2011. "Financial Frictions, Bank Efficiency and Risk: Evidence from the Eurozone," Journal of Business Finance & Accounting, Wiley Blackwell, vol. 38(1-2), pages 259-287, January.
    33. Asli Demirguk-Kunt & Thorsten Beck & Ouarda Merrouche, 2013. "Islamic Banking versus Conventional Banking: Business model, Efficiency, and Stability," Post-Print hal-01638080, HAL.
    34. Wei, Chu & Löschel, Andreas & Liu, Bing, 2013. "An empirical analysis of the CO2 shadow price in Chinese thermal power enterprises," Energy Economics, Elsevier, vol. 40(C), pages 22-31.
    35. International Monetary Fund, 2002. "Islamic Financial Institutions and Products in the Global Financial System: Key Issues in Risk Management and Challenges Ahead," IMF Working Papers 2002/192, International Monetary Fund.
    36. Simar, Leopold & Wilson, Paul W., 2007. "Estimation and inference in two-stage, semi-parametric models of production processes," Journal of Econometrics, Elsevier, vol. 136(1), pages 31-64, January.
    37. Molinos-Senante, María & Hanley, Nick & Sala-Garrido, Ramón, 2015. "Measuring the CO2 shadow price for wastewater treatment: A directional distance function approach," Applied Energy, Elsevier, vol. 144(C), pages 241-249.
    38. Kabir, Md. Nurul & Worthington, Andrew & Gupta, Rakesh, 2015. "Comparative credit risk in Islamic and conventional bank," Pacific-Basin Finance Journal, Elsevier, vol. 34(C), pages 327-353.
    39. M. Umer Chapra, 2007. "Challenges Facing the Islamic Financial Industry," Chapters, in: M. Kabir Hassan & Mervyn K. Lewis (ed.), Handbook of Islamic Banking, chapter 21, Edward Elgar Publishing.
    40. Alfred Kammer & Mohamed Norat & Marco Pinon & Ananthakrishnan Prasad & Christopher M Towe & Zeine Zeidane, 2015. "Islamic Finance; Opportunities, Challenges, and Policy Options," IMF Staff Discussion Notes 15/5, International Monetary Fund.
    41. Košak, Marko & Li, Shaofang & Lončarski, Igor & Marinč, Matej, 2015. "Quality of bank capital and bank lending behavior during the global financial crisis," International Review of Financial Analysis, Elsevier, vol. 37(C), pages 168-183.
    42. Drake, Leigh & Hall, Maximilian J.B. & Simper, Richard, 2006. "The impact of macroeconomic and regulatory factors on bank efficiency: A non-parametric analysis of Hong Kong's banking system," Journal of Banking & Finance, Elsevier, vol. 30(5), pages 1443-1466, May.
    43. Mester, Loretta J., 1996. "A study of bank efficiency taking into account risk-preferences," Journal of Banking & Finance, Elsevier, vol. 20(6), pages 1025-1045, July.
    44. Mariani Abdul-Majid & David Saal & Giuliana Battisti, 2011. "The impact of Islamic banking on the cost efficiency and productivity change of Malaysian commercial banks," Applied Economics, Taylor & Francis Journals, vol. 43(16), pages 2033-2054.
    45. Aggarwal, Rajesh K & Yousef, Tarik, 2000. "Islamic Banks and Investment Financing," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 32(1), pages 93-120, February.
    46. Miller, Stephen M. & Noulas, Athanasios G., 1996. "The technical efficiency of large bank production," Journal of Banking & Finance, Elsevier, vol. 20(3), pages 495-509, April.
    47. Zhu, Ning & Wu, Yanrui & Wang, Bing & Yu, Zhiqian, 2019. "Risk preference and efficiency in Chinese banking," China Economic Review, Elsevier, vol. 53(C), pages 324-341.
    48. Mohammed Obaidullah, 2005. "The Islamic Financial Services الخدمات المالية الإسلامية," Books published by the Islamic Economics Institute, KAAU., King Abdulaziz University, Islamic Economics Institute., edition 1, number 40, July.
    49. Chong, Beng Soon & Liu, Ming-Hua, 2009. "Islamic banking: Interest-free or interest-based?," Pacific-Basin Finance Journal, Elsevier, vol. 17(1), pages 125-144, January.
    50. Fare, Rolf & Grosskopf, Shawna & Noh, Dong-Woon & Weber, William, 2005. "Characteristics of a polluting technology: theory and practice," Journal of Econometrics, Elsevier, vol. 126(2), pages 469-492, June.
    51. Chortareas, Georgios E. & Girardone, Claudia & Ventouri, Alexia, 2013. "Financial freedom and bank efficiency: Evidence from the European Union," Journal of Banking & Finance, Elsevier, vol. 37(4), pages 1223-1231.
    52. Matthews, Kent & Ismail, Mahadzir, 2006. "Efficiency and Productivity Growth of Domestic and Foreign Commercial Banks in Malaysia," Cardiff Economics Working Papers E2006/2, Cardiff University, Cardiff Business School, Economics Section.
    53. Mumtaz Hussain & Asghar Shahmoradi & Rima Turk, 2016. "An Overview of Islamic Finance," Journal of International Commerce, Economics and Policy (JICEP), World Scientific Publishing Co. Pte. Ltd., vol. 7(01), pages 1-28, February.
    54. Brei, Michael & Schclarek, Alfredo, 2013. "Public bank lending in times of crisis," Journal of Financial Stability, Elsevier, vol. 9(4), pages 820-830.
    55. Po‐Chi Chen & Ming‐Miin Yu & Ching‐Cheng Chang & Shih‐Hsun Hsu, 2007. "Productivity change in Taiwan's farmers' credit unions: a nonparametric risk‐adjusted Malmquist approach," Agricultural Economics, International Association of Agricultural Economists, vol. 36(2), pages 221-231, March.
    56. Cheng, Gang & Zervopoulos, Panagiotis & Qian, Zhenhua, 2013. "A variant of radial measure capable of dealing with negative inputs and outputs in data envelopment analysis," European Journal of Operational Research, Elsevier, vol. 225(1), pages 100-105.
    57. Fukuyama, Hirofumi & Weber, William L., 2009. "A directional slacks-based measure of technical inefficiency," Socio-Economic Planning Sciences, Elsevier, vol. 43(4), pages 274-287, December.
    58. Chaibi, Hasna & Ftiti, Zied, 2015. "Credit risk determinants: Evidence from a cross-country study," Research in International Business and Finance, Elsevier, vol. 33(C), pages 1-16.
    59. Sturm, Jan-Egbert & Williams, Barry, 2004. "Foreign bank entry, deregulation and bank efficiency: Lessons from the Australian experience," Journal of Banking & Finance, Elsevier, vol. 28(7), pages 1775-1799, July.
    60. Delis, Manthos & Iosifidi, Maria & Tsionas, Mike G, 2017. "Endogenous bank risk and efficiency," European Journal of Operational Research, Elsevier, vol. 260(1), pages 376-387.
    61. Godfred A. Bokpin, 2016. "Bank governance, regulation and risk-taking in Ghana," Journal of African Business, Taylor & Francis Journals, vol. 17(1), pages 52-68, January.
    62. Saibal Ghosh, 2016. "Does economic freedom matter for risk-taking? Evidence from MENA banks," Review of Behavioral Finance, Emerald Group Publishing Limited, vol. 8(2), pages 114-136, November.
    63. Chen, Xiaogang & Skully, Michael & Brown, Kym, 2005. "Banking efficiency in China: Application of DEA to pre- and post-deregulation eras: 1993-2000," China Economic Review, Elsevier, vol. 16(3), pages 229-245.
    64. Ning Zhu & Bing Wang & Zhiqian Yu & Yanrui Wu, 2016. "Technical Efficiency Measurement Incorporating Risk Preferences: An Empirical Analysis of Chinese Commercial Banks," Emerging Markets Finance and Trade, Taylor & Francis Journals, vol. 52(3), pages 610-624, March.
    65. Beck, Thorsten & Demirgüç-Kunt, Asli & Merrouche, Ouarda, 2013. "Islamic vs. conventional banking: Business model, efficiency and stability," Journal of Banking & Finance, Elsevier, vol. 37(2), pages 433-447.
    66. Dr. Kassim Dakhlallah Author_Email: Kdakhlallah@aud.edu & Dr. Hela Miniaoui, 2011. "Islamic Banks Vs. Non Islamic Ethical Dimensions," 2nd International Conference on Business and Economic Research (2nd ICBER 2011) Proceeding 2011-389, Conference Master Resources.
    67. Sealey, Calvin W, Jr & Lindley, James T, 1977. "Inputs, Outputs, and a Theory of Production and Cost at Depository Financial Institutions," Journal of Finance, American Finance Association, vol. 32(4), pages 1251-1266, September.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Gulati, Rachita, 2022. "Global and local banking crises and risk-adjusted efficiency of Indian banks: Are the impacts really perspective-dependent?," The Quarterly Review of Economics and Finance, Elsevier, vol. 84(C), pages 23-39.
    2. Hassan, M. Kabir & Aliyu, Sirajo, 2018. "A contemporary survey of islamic banking literature," Journal of Financial Stability, Elsevier, vol. 34(C), pages 12-43.
    3. Boussemart, Jean-Philippe & Leleu, Hervé & Shen, Zhiyang & Vardanyan, Michael & Zhu, Ning, 2019. "Decomposing banking performance into economic and credit risk efficiencies," European Journal of Operational Research, Elsevier, vol. 277(2), pages 719-726.
    4. Fukuyama, Hirofumi & Matousek, Roman, 2017. "Modelling bank performance: A network DEA approach," European Journal of Operational Research, Elsevier, vol. 259(2), pages 721-732.
    5. Bansal, Pooja & Kumar, Sunil & Mehra, Aparna & Gulati, Rachita, 2022. "Developing two dynamic Malmquist-Luenberger productivity indices: An illustrated application for assessing productivity performance of Indian banks," Omega, Elsevier, vol. 107(C).
    6. Pejman Abedifar & Shahid M. Ebrahim & Philip Molyneux & Amine Tarazi, 2015. "Islamic Banking And Finance: Recent Empirical Literature And Directions For Future Research," Journal of Economic Surveys, Wiley Blackwell, vol. 29(4), pages 637-670, September.
    7. Salma Louati & Younes Boujelbene, 2021. "Basel Regulations and Banks’ Risk-efficiency Nexus: Evidence from Dynamic Simultaneous-equation Models," Journal of African Business, Taylor & Francis Journals, vol. 22(4), pages 578-602, October.
    8. Louhichi, Awatef & Louati, Salma & Boujelbene, Younes, 2020. "The regulations–risk taking nexus under competitive pressure: What about the Islamic banking system?," Research in International Business and Finance, Elsevier, vol. 51(C).
    9. Hassan, M. Kabir & Khan, Ashraf & Paltrinieri, Andrea, 2019. "Liquidity risk, credit risk and stability in Islamic and conventional banks," Research in International Business and Finance, Elsevier, vol. 48(C), pages 17-31.
    10. Ibrahim, Mansor H. & Rizvi, Syed Aun R., 2018. "Bank lending, deposits and risk-taking in times of crisis: A panel analysis of Islamic and conventional banks," Emerging Markets Review, Elsevier, vol. 35(C), pages 31-47.
    11. Ihsen Abid & Mohamed Goaied & Mouldi Ben Ammar, 2019. "Conventional and Islamic Banks’ Performance in the Gulf Cooperation Council Countries; Efficiency and Determinants," Journal of Quantitative Economics, Springer;The Indian Econometric Society (TIES), vol. 17(3), pages 623-665, September.
    12. Asmild, Mette & Kronborg, Dorte & Mahbub, Tasmina & Matthews, Kent, 2019. "The efficiency patterns of Islamic banks during the global financial crisis: The case of Bangladesh," The Quarterly Review of Economics and Finance, Elsevier, vol. 74(C), pages 67-74.
    13. Fujii, Hidemichi & Managi, Shunsuke & Matousek, Roman, 2014. "Indian bank efficiency and productivity changes with undesirable outputs: A disaggregated approach," Journal of Banking & Finance, Elsevier, vol. 38(C), pages 41-50.
    14. Safiullah, Md, 2020. "Bank governance and crisis-period efficiency: A multinational study on Islamic and conventional banks," Pacific-Basin Finance Journal, Elsevier, vol. 62(C).
    15. Mamatzakis, Emmanuel & Matousek, Roman & Vu, Anh Nguyet, 2016. "What is the impact of bankrupt and restructured loans on Japanese bank efficiency?," Journal of Banking & Finance, Elsevier, vol. 72(S), pages 187-202.
    16. Saleh, Ali Salman & Moradi-Motlagh, Amir & Zeitun, Rami, 2020. "What are the drivers of inefficiency in the Gulf Cooperation Council banking industry? A comparison between conventional and Islamic banks," Pacific-Basin Finance Journal, Elsevier, vol. 60(C).
    17. Saeed, Momna & Izzeldin, Marwan & Hassan, M. Kabir & Pappas, Vasileios, 2020. "The inter-temporal relationship between risk, capital and efficiency: The case of Islamic and conventional banks," Pacific-Basin Finance Journal, Elsevier, vol. 62(C).
    18. Pooja Bansal & Aparna Mehra & Sunil Kumar, 2022. "Dynamic Metafrontier Malmquist–Luenberger Productivity Index in Network DEA: An Application to Banking Data," Computational Economics, Springer;Society for Computational Economics, vol. 59(1), pages 297-324, January.
    19. Abedifar, Pejman & Hasan, Iftekhar & Tarazi, Amine, 2016. "Finance-growth nexus and dual-banking systems: Relative importance of Islamic banks," Journal of Economic Behavior & Organization, Elsevier, vol. 132(S), pages 198-215.
    20. Smaoui, Houcem & Ghouma, Hatem, 2020. "Sukuk market development and Islamic banks’ capital ratios," Research in International Business and Finance, Elsevier, vol. 51(C).

    More about this item

    Keywords

    Non-performing loans; Directional distance function; Technical efficiency; Shadow price; Risk preferences; Islamic banks;
    All these keywords.

    JEL classification:

    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • G32 - Financial Economics - - Corporate Finance and Governance - - - Financing Policy; Financial Risk and Risk Management; Capital and Ownership Structure; Value of Firms; Goodwill

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:ecosys:v:44:y:2020:i:1:s0939362519300482. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: https://edirc.repec.org/data/osteide.html .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.